删除不需要的hud代码，使用GMHud代替

GMBase/Classes/UIViewController+HUD.h

-//
-//  UIViewController+HUD.h
-//  Pods
-//
-//  Created by wangyang on 16/7/11.
-//
-//
-
-#import <UIKit/UIKit.h>
-#import <MBProgressHUD/MBProgressHUD.h>
-NS_ASSUME_NONNULL_BEGIN
-@interface UIViewController (HUD)
-/**
- *	@brief 显示加载动画
- *	@param text 加载动画文字
- */
-- (void)showLoading:(nullable NSString *)text;
-
-/**
- *	@brief 显示隐藏加载
- *	@param text 警告文字
- */
-- (void)hideLoading;
-
-/**
- *	@brief 显示完成信息，1秒后消失
- *	@param text 文字
- */
-- (void)showComplete:(NSString *)text;
-
-/**
- *	@brief 显示警告或错误信息，1秒后消失
- *	@param text 警告文字
- */
-- (void)showWarning:(NSString *)text;
-
-/**
- *  @brief  toast
- *
- *  @param text 仅显示文字提示
- */
-- (void)toast:(NSString *)text;
-
-- (void)toastInView:(NSString *)text;
-@end
-NS_ASSUME_NONNULL_END
\ No newline at end of file

GMBase/Classes/UIViewController+HUD.m

-//
-//  UIViewController+HUD.m
-//  Pods
-//
-//  Created by wangyang on 16/7/11.
-//
-//
-
-#import "UIViewController+HUD.h"
-#import <objc/runtime.h>
-
-@interface UIViewController (HUD)
-@property (nonatomic, strong) MBProgressHUD *hud;
-@end
-
-@implementation UIViewController (HUD)
-- (MBProgressHUD *)hud {
-    return objc_getAssociatedObject(self, @selector(hud));
-}
-
-- (void)setHud:(MBProgressHUD *)hud {
-    objc_setAssociatedObject(self, @selector(hud), hud, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-
-- (NSTimeInterval)timeForHUDString:(NSString *)string {
-    NSInteger count = string.length;
-    if (count < 8) {
-        return 1.0;
-    }else if (count >= 8 && count < 15) {
-        return 2;
-    } else if (count >= 15 && count < 25) {
-        return 3;
-    } else {
-        return 4;
-    }
-}
-
-- (void)showComplete:(NSString *)text
-{
-    [self hideLoading];
-    self.hud = [[MBProgressHUD alloc] initWithView:self.view];
-    [self.view addSubview:self.hud];
-    self.hud.customView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"ToastFinish"]];
-    self.hud.mode = MBProgressHUDModeCustomView;
-    self.hud.removeFromSuperViewOnHide = YES;
-
-    self.hud.delegate = self;
-    if (text!=nil && text.length>20) {
-        self.hud.detailsLabelText = text;
-    }else{
-        self.hud.labelText = text;
-    }
-    [self.hud show:YES];
-    NSTimeInterval timeInterval = [self timeForHUDString:text];
-    [self.hud hide:YES afterDelay:timeInterval];
-}
-
-- (void)showWarning:(NSString *)text
-{
-    [self hideLoading];
-    self.hud = [[MBProgressHUD alloc] initWithView:self.view];
-    [self.view addSubview:self.hud];
-    self.hud.removeFromSuperViewOnHide = YES;
-
-    self.hud.customView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"ToastWarn"]];
-    // Set custom view mode
-    self.hud.mode = MBProgressHUDModeCustomView;
-    self.hud.delegate = self;
-    if (text!=nil && text.length>20) {
-        self.hud.detailsLabelText = text;
-    }else{
-        self.hud.labelText = text;
-    }
-    [self.hud show:YES];
-    NSTimeInterval timeInterval = [self timeForHUDString:text];
-    [self.hud hide:YES afterDelay:timeInterval];
-}
-
-- (void)showLoading:(NSString *)text
-{
-    [self hideLoading];
-    self.hud = [[MBProgressHUD alloc] initWithView:self.view];
-    [self.view addSubview:self.hud];
-    self.hud.removeFromSuperViewOnHide = YES;
-
-    self.hud.mode = MBProgressHUDModeIndeterminate;
-    self.hud.delegate = self;
-    self.hud.labelText = text;
-    [self.hud show:YES];
-
-    UIButton *button = [[self valueForKey:@"navigationBar"] valueForKey:@"rightButton"];
-    button.enabled = NO;
-}
-
-- (void)toast:(NSString *)text{
-    [self hideLoading];
-
-    if (text.length == 0) {
-        return;
-    }
-
-    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:[UIApplication sharedApplication].keyWindow animated:YES];
-    hud.mode = MBProgressHUDModeText;
-    hud.userInteractionEnabled = YES;
-    if (text!=nil && text.length>18) {
-        hud.detailsLabelText = text;
-    }else{
-        hud.labelText = text;
-    }
-    hud.margin = 10.f;
-    hud.removeFromSuperViewOnHide = YES;
-    NSTimeInterval timeInterval = [self timeForHUDString:text];
-    [hud hide:YES afterDelay:timeInterval];
-}
-
-- (void)toastInView:(NSString *)text{
-    if (text.length == 0) {
-        return;
-    }
-    [self hideLoading];
-    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
-    hud.mode = MBProgressHUDModeText;
-    hud.userInteractionEnabled = YES;
-    if (text!=nil && text.length>18) {
-        hud.detailsLabelText = text;
-    }else{
-        hud.labelText = text;
-    }
-    hud.margin = 10.f;
-    hud.removeFromSuperViewOnHide = YES;
-    [hud hide:YES afterDelay:1.0];
-}
-
-- (void)hideLoading
-{
-    [self.hud hide:YES];
-    UIButton *button = [[self valueForKey:@"navigationBar"] valueForKey:@"rightButton"];
-    button.enabled = YES;
-}
-@end

GMBase/Classes/WMBaseCollectionController.h

+//
+//  WMBaseCollectionController.h
+//  Gengmei
+//
+//  Created by wangyang on 9/2/15.
+//  Copyright (c) 2015 Wanmeichuangyi. All rights reserved.
+//
+
+#import "WMBaseViewController.h"
+#import "WMFetchDataViewModel.h"
+#import "OCEmptyView.h"
+
+@interface WMBaseCollectionController : WMBaseViewController <UICollectionViewDelegateFlowLayout,UICollectionViewDataSource>{
+    BOOL _needHeaderRefresh;
+    BOOL _needFooterRefresh;
+    
+    WMFetchDataViewModel *_viewModel;
+    UICollectionView *_collectionView;
+    UICollectionViewLayout *_collectionViewLayout;
+}
+@property (nonatomic, strong) WMFetchDataViewModel *viewModel;
+/** @brief 控制当前VC的viewmodel是不是立即请求网络 **/
+@property (nonatomic , assign) BOOL immediateLoad;
+/**
+ *  @brief  默认大小是self.view.bounds
+ */
+@property (nonatomic, strong) UICollectionView *collectionView;
+
+@property (nonatomic, strong) OCEmptyView *emptyView;
+
+/**
+ *  @brief  默认返回一个 flowLayout
+ @code
+ minimumLineSpacing = 0;
+ minimumInteritemSpacing = 0;
+ itemSize = CGSizeMake(50, 50);
+ @endcode
+
+ 详见具体实现
+ */
+@property (nonatomic, strong) UICollectionViewLayout *collectionViewLayout;
+- (void)updateOtherUIData __attribute__((objc_requires_super));
+
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context __attribute__((objc_requires_super));
+- (void)refreshList;
+- (void)headerRereshing;
+- (void)footerRereshing;
+
+- (void)hideNavigationBar;
+- (void)hideEmptyView;
+- (NSString *)getEmptyText;
+@end

GMBase/Classes/WMBaseCollectionController.m

+//
+//  WMBaseCollectionController.m
+//  Gengmei
+//
+//  Created by wangyang on 9/2/15.
+//  Copyright (c) 2015 Wanmeichuangyi. All rights reserved.
+//
+
+#import "WMBaseCollectionController.h"
+#import <GMRefresh/GMRefreshFooter.h>
+#import <GMRefresh/GMRefreshHeader.h>
+#import <Masonry/Masonry.h>
+
+@interface WMBaseCollectionController () <OCEmptyViewDelegate>
+
+@end
+
+@implementation WMBaseCollectionController
+@synthesize viewModel = _viewModel;
+@synthesize collectionView = _collectionView;
+@synthesize collectionViewLayout = _collectionViewLayout;
+
+- (void)initController{
+    
+    [super initController];
+    self.viewModel = [[WMFetchDataViewModel alloc] init];
+    _needHeaderRefresh = YES;
+    _needFooterRefresh = YES;
+    _immediateLoad = YES;
+}
+
+
+- (void)viewDidLoad{
+    
+    [super viewDidLoad];
+    [self addKVO];
+
+    [self.view addSubview:self.collectionView];
+    [_collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
+        make.edges.equalTo(self.view).insets(UIEdgeInsetsMake(64, 0, 0, 0));
+    }];
+    
+    // collectionView的EmptyView
+    _emptyView = [[OCEmptyView alloc] initWithFrame:CGRectZero];
+    _emptyView.hidden = YES;
+    if([self getEmptyText].length > 0){
+        _emptyView.tipText = [self getEmptyText];
+    }
+    _emptyView.delegate = self;
+    [self.view addSubview:_emptyView];
+    [_emptyView mas_makeConstraints:^(MASConstraintMaker *make) {
+        make.left.mas_equalTo(0);
+        make.right.mas_equalTo(0);
+        make.top.mas_equalTo(0);
+        make.bottom.mas_equalTo(0);
+    }];
+
+    
+    __weak __typeof(self)weakSelf = self;
+    if (_needHeaderRefresh) {
+        _collectionView.mj_header = [GMRefreshHeader headerWithRefreshingBlock:^{
+            [weakSelf headerRereshing];
+        }];
+    }
+    if (_needFooterRefresh) {
+        _collectionView.mj_footer = [GMRefreshFooter footerWithRefreshingBlock:^{
+            [weakSelf footerRereshing];
+        }];
+    }
+
+
+    //获取数据
+    if (_immediateLoad) {
+        [self loadRemoteData];
+    }
+}
+
+- (void)hideNavigationBar {
+    self.navigationBar.hidden = YES;
+    [_collectionView mas_updateConstraints:^(MASConstraintMaker *make) {
+        make.top.mas_equalTo(0);
+    }];
+}
+
+
+- (void)addKVO
+{
+    [self.viewModel addObserver:self forKeyPath:@"fetchDataSuccess" options:NSKeyValueObservingOptionNew context:NULL];
+}
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
+    if ([keyPath isEqualToString:@"fetchDataSuccess"] && object == self.viewModel) {
+        [self hideLoading];
+        _collectionView.hidden = NO;
+        if ([[_viewModel fetchDataSuccess] boolValue]) {
+            if ([[self.viewModel dataArray] count] == 0 && [self.viewModel fetchDataNilMsg]) {
+                [self showEmptyView:OCEmptyViewTypeEmpty];
+            } else {
+                [self hideEmptyView];
+            }
+            
+        }else{
+            [self showEmptyView:OCEmptyViewTypeException];
+        }
+
+        // 调用reloadData，并不会立即执行，而是下更新周期来了之后才可以。
+        // 将 endRefreshing 与 endRefreshing 放到后面的好处就是此时可以利用 updateOtherUIData 做点额外的事。比如判断mj_header.isRefreshing
+        [self updateOtherUIData];
+        if (_collectionView) {
+            [_collectionView reloadData];
+            [_collectionView.mj_header endRefreshing];
+            [_collectionView.mj_footer endRefreshing];
+        }
+    }
+}
+
+- (void)dealloc{
+    [self removeKVO];
+
+    if (self.isViewLoaded) {
+        [self.viewModel removeObserver:self forKeyPath:@"fetchDataSuccess"];
+    }
+}
+
+- (void)removeKVO{
+
+}
+/**
+ *  @brief  下拉刷新
+ */
+- (void)headerRereshing
+{
+    [self.viewModel handleHeaderRefreshing];
+}
+
+/**
+ *  @brief  上拉加载更多
+ */
+- (void)footerRereshing
+{
+    [self.viewModel handleFooterRereshing];
+}
+
+
+- (void)updateOtherUIData{
+    
+    // 如果 contentSize 高没有 _collectionView.bounds.size.height 这个大，就强制设置一下，这样 collectionView 还能下拉滑动，以保证上拉、下拉正常使用
+    if (_collectionView.contentSize.height <= _collectionView.bounds.size.height) {
+        _collectionView.contentSize = CGSizeMake(_collectionView.bounds.size.width, _collectionView.bounds.size.height);
+    }
+}
+
+- (void)refreshList{
+    [self.viewModel setStartNum:0];
+    [[self.viewModel dataArray] removeAllObjects];
+    [_collectionView reloadData];
+
+    [self loadRemoteData];
+}
+
+- (void)loadRemoteData {
+    [self showLoading:nil];
+    [self.viewModel fetchRemoteData];
+}
+
+- (void)didMoveToParentViewController:(UIViewController *)parent {
+    [super didMoveToParentViewController:parent];
+    if (parent != nil && ![parent isKindOfClass:[UINavigationController class]]) {
+        [_collectionView mas_remakeConstraints:^(MASConstraintMaker *make) {
+            make.edges.equalTo(self.view).insets(UIEdgeInsetsMake(0, 0, 0, 0));
+        }];
+    }
+}
+
+#pragma mark - UICollectionViewDelegate and UICollectionViewDataSource
+
+- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
+    return self.viewModel.dataArray.count;
+}
+
+- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
+    return nil;
+}
+
+
+#pragma mark - Setter and Getter
+
+- (UICollectionView *)collectionView{
+    
+    if (!_collectionView) {
+        _collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:self.collectionViewLayout];
+        _collectionView.backgroundColor = [UIColor whiteColor];
+        _collectionView.delegate = self;
+        _collectionView.alwaysBounceVertical = YES;
+        _collectionView.dataSource = self;
+        _collectionView.hidden = YES;
+    }
+    return _collectionView;
+}
+
+- (UICollectionViewLayout *)collectionViewLayout{
+    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
+    layout.minimumLineSpacing = 3;
+    layout.minimumInteritemSpacing = 3;
+    layout.itemSize = CGSizeMake(50, 50);
+    
+    _collectionViewLayout = layout;
+    return _collectionViewLayout;
+}
+
+- (void)showEmptyView:(OCEmptyViewType)type {
+    _emptyView.type = type;
+    _emptyView.hidden = NO;
+    [self getEmptyText];
+    [_emptyView setNeedsLayout];
+}
+
+- (void)hideEmptyView {
+    _emptyView.hidden = YES;
+}
+
+#pragma mark - OCEmptyViewDelegate
+
+- (void)emptyViewDidClickReload{
+    [self loadRemoteData];
+}
+
+- (NSString *)getEmptyText{
+    if (self.viewModel.message.length > 0) {
+        return self.viewModel.message;
+    }
+    return @"";
+}
+
+
+@end